I would never leave the safety of my bedroom to clear my house, assume a planned out defensive posture and call and await the arrival of the police, there is nothing in the home worth getting into a battle over, however it they breach my bedroom door then it is on and at 15 feet or so the shotty doesn't need too much more than to be pointed in the right direction. as for the OK corral nonsense, maybe you are unaware of the typical SD situation, if not try learning before commenting.
maybe you are the rooster cogburn who thinks he can shoot up all the time, I am not that guy.